Will the bearring and weld hole if you take the crank out and but in a jackshaft? Also does regular bike chain work or is it to weak?
Have one of those myself. Pretty durable little engines. 98cc, and they are 3 hp but at 4400 rpm. Also have an old bike sitting around that has a retro look to it. I've been thinking about putting them together too. Engine is fairly compact, but in my case I will have to shorten the crankshaft to fit between the pedals. I'm thinking direct belt drive on mine with about a 14 inch driven pulley, it came out to about 35 or so mph at max rpm. Just need some ambition. Keep us apprised of your progress.
also the motor is self throttled at the time i may be able to use that at start up, like for chain saws have the smae try og thing but only at 1/2 throttle.